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First results for the two-spin parameter ALL in pi0 production by 200 GeV polarized protons and antiprotons (Articolo in rivista)

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First results for the two-spin parameter ALL in pi0 production by 200 GeV polarized protons and antiprotons (Articolo in rivista) (literal)

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D.L. Adams, N. Akchurin, N.I. Belikov, j. Bystricky, p. Chaumette, M.D. Corcoran, J.D. Cossairt, j. Cranshaw, J. Deregel, A.A. Derevschikov, G. Durand, H. En'yo, J. Fabre, K. Fukuda, H. Funahashi, Y. Goto, O.A. Grachov, D.P. Grosnick, D.A. Hill, K. Imai, Y. Itow, K. Iwatani, T. Kasprzyk, K.W. Krueger, J, K. Kuroda, M. Laghai, F. Lehar, A. de Lesquen, D. Lopiano, F.C. Luehring, T. Maki, S. Makino, A. Masaike, Yu.A. Matulenko, A.P. Meschanin, A. Michalowicz, D.H. Miller, K. Miyake, T. Nagamine, F. Nessi-Tedaldi, M. Nessi, C. Nguyen, S.B. Nurushev, Y. Ohashi, y. Onel, D.I. Patalakha, G. Pauletta, A. Penzo, A.L. Read, J.B. Roberts, L. van Rossum, V.L. Rykov, N. Saito, G. Salvato, P. Schiavon, j. Shepard, j. Skeens, V.L. Solovyanov, H. Spinka, R. Takashima, F. Takeutchi, N. Tamura, N. Tanaka, D.G. Underwood, A.N. Vasiliev, A. Villari, J.L. White, S. Yamashita, A. Yokosawa, T. Yoshida and A. Zanetti (1991)
First results for the two-spin parameter ALL in pi0 production by 200 GeV polarized protons and antiprotons
in Physics letters. B (Print)
(literal)

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D.L. Adams, N. Akchurin, N.I. Belikov, j. Bystricky, p. Chaumette, M.D. Corcoran, J.D. Cossairt, j. Cranshaw, J. Deregel, A.A. Derevschikov, G. Durand, H. En'yo, J. Fabre, K. Fukuda, H. Funahashi, Y. Goto, O.A. Grachov, D.P. Grosnick, D.A. Hill, K. Imai, Y. Itow, K. Iwatani, T. Kasprzyk, K.W. Krueger, J, K. Kuroda, M. Laghai, F. Lehar, A. de Lesquen, D. Lopiano, F.C. Luehring, T. Maki, S. Makino, A. Masaike, Yu.A. Matulenko, A.P. Meschanin, A. Michalowicz, D.H. Miller, K. Miyake, T. Nagamine, F. Nessi-Tedaldi, M. Nessi, C. Nguyen, S.B. Nurushev, Y. Ohashi, y. Onel, D.I. Patalakha, G. Pauletta, A. Penzo, A.L. Read, J.B. Roberts, L. van Rossum, V.L. Rykov, N. Saito, G. Salvato, P. Schiavon, j. Shepard, j. Skeens, V.L. Solovyanov, H. Spinka, R. Takashima, F. Takeutchi, N. Tamura, N. Tanaka, D.G. Underwood, A.N. Vasiliev, A. Villari, J.L. White, S. Yamashita, A. Yokosawa, T. Yoshida and A. Zanetti (literal)

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T.W. Bonner Nuclear Laboratory, Rice University, Houston, TX 77251, USA Department of Physics, University oflowa, Iowa City, IA 52242, USA Institute of High Energy Physics, SU-142 284 Serpukhov, USSR CEN-Saclay, F-91191 Gif-sur-Yvette, France Fermi National Accelerator Laboratory, Batavia, IL 60510, USA Department of Physics, Kyoto University, Kyoto 606, Japan Meiji CollegeofOrientalMedicine, Funai-gun, Kyoto-fu 629-03, Japan Argonne National Laboratory, Argonne, IL 60439, USA Hiroshima University, Higashi-Hiroshima 724, Japan Northeastern State University, Talequah, OK 74464, USA Laboratoire de Physique des Particules, BP 909, F- 74017 Annecy-le- Vieux, France Physics Department, Northwestern University, Evanston, IL 60201, USA UniversityofOccupationalandEnvironmentalHealth, Kita-Kyushu 807, Japan University of Udine, 1-33100 Udine, Italy Dipartimento di Fisica, University of Trieste, 1-34100 Trieste, Italy Dipartimento di Fisica, University of Messina, 1-98100 Messina, Italy Kyoto University of Education, Kyoto 612, Japan Kyoto-Sangyo University, Kyoto 612, Japan Okayama University, Okayama 700, Japan Los Alamos National Laboratory, Los Alamos, NM 8 7545, USA Osaka City University, Osaka 558, Japan (literal)

Titolo

First results for the two-spin parameter ALL in pi0 production by 200 GeV polarized protons and antiprotons (literal)

Abstract

The two-spin parameter A(LL) in inclusive pi-0 production by longitudinally-polarized protons and antiprotons on a longitudinally-polarized proton target has been measured at the 200 GeV Fermilab spin physics facility, for pi-0,s at X(F) = 0 with 1 less-than-or-equal-to p(t) less-than-or-equal-to 3 GeV/c. The results exclude, at the 95% confidence level, values of A(LL) (pp) > 0.1 and < -0.1, for pi-0,s produced by protons, and values of A(LL) (antiproton-antiproton) > 0.1 and < -0.2 for incident antiprotons. The relevance of A(LL) (pp) for the gluon spin density is discussed. The data are in good agreement with \"conventional\", small or zero, gluon polarization. (literal)

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